. >> in mexico city, at least 25 people are wounded after the explosion at the headquarters of mexico's state owned oil form, the amex. dozens were reportedly trapped after the explosion with authorities warning the number of casualties could rise. the blast occurred in the basement of the building an office complex that also houses one of the city's tallest skyscrapers. the cause of the blast is still unknown. the company said the region they have to evacuate the building because of an electrical issue, but later tweeted that the attorney general's office was investigating the blast. and other news from mexico, thousands of campesinos marched in the capital thursday to protest the planting of genetically modified corn by u.s. corporations. u.s. firms monsanto, dupont, and dow have applied for permits to grow millions of acres of genetically modified corn in northern mexico. opponents say the crops will inflict poverty and forced migration on indigenous people and peasants, some of whom have been farming corn for generations. the national union of autonomous regional peasant organizations has